J/AJ/109/874ivo://CDS.VizieR/J/AJ/109/874doi:10.26093/cds/vizier.51090874CDSBeers T.C.Kriessler J.R.Bird C.M.Huchra J.P.2023-04-06T16:50:12Z1999-01-16T16:06:00ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxy-clustersredshiftedWe report 472 new redshifts for 416 galaxies in the regions of the 23 poor clusters of galaxies originally identified by Morgan, Kayser, and White, and Albert, White and Morgan. Eighteen of the poor clusters now have 10 or more available redshifts within 1.5h^-1 Mpc of the central galaxy; 11 clusters have at least 20 available redshifts. Based on the 21 clusters for which we have sufficient velocity information, the median velocity scale is 336 km/s, a factor of 2 smaller than found for rich clusters. Several of the poor clusters exhibit complex velocity distributions due to the presence of nearby clumps of galaxies. We check on the velocity of the dominant galaxy in each poor cluster relative to the remaining cluster members. Significantly high relative velocities of the dominant galaxy are found in only 4 of 21 poor clusters, 3 of which we suspect are due to contamination of the parent velocity distribution. Several statistical tests indicate that the D/cD galaxies are at the kinematic centers of the parent poor cluster velocity distributions. Mass-to-light ratios for 13 of the 15 poor clusters for which we have the required data are in the range 50 <= M/L_B(0) <= 200 Msun/Lsun. The complex nature of the regions surrounding many of the poor clusters suggests that these groupings may represent an early epoch of cluster formation. For example, the poor clusters MKW7 and MKW8 are shown to be gravitationally bound and likely to merge to form a richer cluster within the next several Gyrs. Eight of the nine other poor clusters for which simple two-body dynamical models can be carried out are consistent with being bound to other clumps in their vicinity. Additional complex systems with more than two gravitationally bound clumps are observed among the poor clusters.1995AJ....109..874Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/109/874CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/144 : The CfA redshift catalogue (Huchra et al., 1992))https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/109/874https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/109/874http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/109/874https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/109/874https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/109/874http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/109/874GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/109/874/table2 (*Velocities for galaxies in poor clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/109/874/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/109/874/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/109/874/table2?GETtext/xml+votable180.050000true148.0358-1.98540.0055555555555555565/597-598 1128-1129 2066-2067 2143 2231 2321 6497 6612-6614 6643 6913 6950 7109 6/1020 1023 1699 1704-1705 1707 2387 2397-2398 3072 4113 4491-4494 4506 4520-4521 4524-4526 4530-4532 4534 4537-4538 4540 4869 4881 8223 8232 8235 8256 8261 8280 8282 8288-8289 8291-8293 8304 8320-8321 8563-8564 8566-8568 8570-8571 8658-8661 8663 8665 8669 8706 8712 8714 8913-8914 8916-8917 8919-8922 8944-8945 9002 9088 9090 9096 9098-9099 9121-9122 9256 9258 9280 9282 9288 9290 9294 9296 9298 9304-9305 9316-9317 9328 9345-9346 9352 10820 10826-10827 10840 10842 10849 10852 10858 25550 25569 25572 25581 25583-25584 25593 25599 25895 25898 25902 25906 25912 25915 25918 25961 25965 25970 25974-25975 25977-25979 25981-25983 25996-25997 26002-26003 26008 26010 26013 26049 26051 26053-26054 26062 26065 26068 26070-26071 26076-26077 26095 26106-26107 26110-26111 26279 26281-26282 26284-26286 26437 26439 26445 26460-26461 26463 26469 26472 26474-26475 26481 26483 26485-26487 26519 26560-26561 26563-26564 26566 26569 26576 26584 26586 26596 26598 26830 26854-26855 26861 26866-26867 26870 26873 26950-26951 26961 27042 27165 27191 27203 27206 27208-27210 27215 27238 27279 27300 27303 27310 27313-27315 27317-27319 27324 27327 27649-27650 27656 27659-27662 27672 27674 27781 27783 27789-27790 27794 27798-27799 27805-27806 27824 27826-27828 27830-27831 27836 27872 28087 28089-28090 28092 28421 28429 28432 28434-28435 28441 28443-28444 28446-28447 28465 28467 28469 28471 28473 28475-28476 28478-28479 28481-28482 28488 28490-28492 28494 28512-28513 28515 28518 28523 28565 28608 31415 31435 31459 31462 31465-31468 31474https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/109/874?format=asciiOpticaldefaultJ/AJ/109/874/table2*Velocities for galaxies in poor clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterMKW or AWM cluster numbermeta.id.part;meta.maincharGalaxyName of the galaxymeta.idcharIDGalaxy identification number with samplemeta.id.part;meta.maincharRA1950Right ascension 1950.0pos.eq.ra;meta.mainDE1950Dec.pos.eq.dec;meta.mainmB0? Apparent magnitude on Zwicky B0 scalemagphot.mag;em.opt.BfloatnullableRVGalaxy heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricinte_RVGalaxy heliocentric radial velocity errorkm/sstat.errorintSourceSource codesmeta.codechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed